Figs. 18, 19 in Oocytes, Larvae, and Cleptoparasitic Behavior of Biastes emarginatus (Hymenoptera: Apidae: Nomadinae: Biastini)

Figs. 18, 19. Microphotographs of cleared head of Biastes emarginatus, lateral (18) and ventral (19) views, respectively. Fig. 20. Microphotographs of cleared head of Neopasites cressoni, lateral view, showing greater curvature to frontal profile. Fig. 21. Microphotograph of side of cleared head of mature larvae of Biastes emarginatus, showing texture of integument associate with rear part of head. Fig. 22. Microphotograph of spiracle of mature larva of Biastes emarginatus, side view. PTP 5 posterior tentorial pit.